Given that the solution is 10.2 wt% NiSO₄·6H₂O, this means that 10.2% of the total mass of the solution is NiSO₄·6H₂O.
\[
\text{Mass of NiSO}_4 \cdot 6\text{H}_2\text{O} = 10.0 \, \text{g} \times \frac{10.2}{100} = 1.02 \, \text{g}
\]
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